Garmin GTX 23 ES, Руководство по установке

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GTX 23 Installation Manual Page 2-3
190-00906-01 Revision A
2.4 Cabling and Wiring
Refer to the interconnect examples in Appendix C for wire gauge guidance.
Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI interference.
Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling and
routing near aircraft control cables. It is also good practice to avoid routing cables near sharp edges
because aircraft vibration might wear away the insulation on the wires, which will leave them exposed to
moisture and potentially create arcing or intermittent short circuits.
The GTX 23 back-plate assembly utilizes a BNC-type (bayonet connection) coaxial connector.
The maximum attenuation at 1090 MHz between the unit and the antenna must not exceed 1.5 dB. This
loss specification includes connector loss; for example, through a bulkhead connector. The following table
lists examples of recommended antenna cable. One can determine the length of cable needed to connect
the transponder to the antenna, and then use the table to look up a recommended cable manufacturer and
part number that will meet the 1.5 dB loss spec. The table assumes a loss figure of 0.2 dB per connector.
Note that any 50
Ω , double shielded coaxial cable assembly that meets airworthiness requirements and the
1.5 dB maximum loss figure (including connectors) may be used.
Max. Length
(feet – [m])
Insertion loss
(dB/100ft)
ECS Type MIL-C-17 Type RG Type
6' 1.3" [1.86m] 18.0 M17/128-RG400 RG-400
7' 7.3" [2.32m] 14.45 3C142B
9' 2.0" [2.79m] 12.00 M17/112-RG304 RG-304
12' 6.0" [3.81m] 8.80 311601 M17/127-RG393 RG-393
15' 5.4" [4.71m] 7.12 311501
19' 9.4" [6.03m] 5.56 311201
30' 3.6" [9.24m] 3.63 310801
Supplier
Information
Vendor: Electronic
Cable Specialists
5300 W. Franklin Drive
Franklin, WI 53132
Tel: 800-327-9473
414-421-5300
Fax: 414-421-5301
www.ecsdirect.com
See current issue of
Qualified Products
List QPL-17.
RG types are
obsolete and are
shown for
reference only;
replaced by M17
type numbers.